Synchrotron self-Compton gamma-rays from active galactic nuclei

We compare the radio and the gamma-ray properties of active galactic nuclei using data from the Metsahovi radio monitoring program and from the EGRET Phase 1-3 catalogs. We find statistically significant correlations between the average gamma-ray flux and the time averaged radio properties, as well as between the gamma-ray flux during an individual EGRET pointing and the c ontemporary radio hare parameters. In particular, the gamma-ray hares do no t precede the radio variations, but instead occur preferentially during the growth stages of millimeter hares. Gamma-rays must therefore be produced i n the shocked regions of AGN jets, with the synchrotron self-Compton mechan ism as the most likely mechanism. Models which assume gamma-ray production closer to the central black hole / accretion disk are not in accordance wit h the data.